1) 2H2S+O2=2S+2H2O
Fe+S=FeS
4FeS+7O2=2Fe2O3+4SO2
SO2+H2O=H2SO3
H2S+2NaOH=Na2S+2H2O
S+2Na=Na2S
2) Zn+H2S → ZnS + H2
ZnS + O2 → Zn + SO2
SO2+ O2 → 2SO3
SO3 + H2O → H2SO4
Ca + H2SO4 → CaSo4 + H2
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Answers & Comments
1) 2H2S+O2=2S+2H2O
Fe+S=FeS
4FeS+7O2=2Fe2O3+4SO2
SO2+H2O=H2SO3
H2S+2NaOH=Na2S+2H2O
S+2Na=Na2S
2) Zn+H2S → ZnS + H2
ZnS + O2 → Zn + SO2
SO2+ O2 → 2SO3
SO3 + H2O → H2SO4
Ca + H2SO4 → CaSo4 + H2